US4483185A - Apparatus for checking valve clearance of the inlet and exhaust of a piston engine - Google Patents

Apparatus for checking valve clearance of the inlet and exhaust of a piston engine Download PDF

Info

Publication number
US4483185A
US4483185A US06/492,653 US49265383A US4483185A US 4483185 A US4483185 A US 4483185A US 49265383 A US49265383 A US 49265383A US 4483185 A US4483185 A US 4483185A
Authority
US
United States
Prior art keywords
valve
gate circuit
processor unit
angle
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/492,653
Other languages
English (en)
Inventor
Wilhelm Kunzfeld
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
A V L GESELLSCHAFT fur VERBRENNUNGSKRAFTMASCHINEN und MESSTECHNIK MBH PROF DR DR HC HANS LIST KLEISTSTRASSE 48 A-8020 RAZ AN AUSTRIAN CORP
AVL List GmbH
Original Assignee
AVL List GmbH
AVL Gesellschaft fuer Verbrennungskraftmaschinen und Messtechnik mbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AVL List GmbH, AVL Gesellschaft fuer Verbrennungskraftmaschinen und Messtechnik mbH filed Critical AVL List GmbH
Assigned to A V L GESELLSCHAFT FUR VERBRENNUNGSKRAFTMASCHINEN UND MESSTECHNIK M.B.H., PROF. DR. DR. H.C. HANS LIST, KLEISTSTRASSE 48, A-8020 RAZ, AN AUSTRIAN CORP. reassignment A V L GESELLSCHAFT FUR VERBRENNUNGSKRAFTMASCHINEN UND MESSTECHNIK M.B.H., PROF. DR. DR. H.C. HANS LIST, KLEISTSTRASSE 48, A-8020 RAZ, AN AUSTRIAN CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: KUNZFELD, WILHELM
Application granted granted Critical
Publication of US4483185A publication Critical patent/US4483185A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines
    • G01M15/04—Testing internal-combustion engines
    • G01M15/12—Testing internal-combustion engines by monitoring vibrations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20—Adjusting or compensating clearance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/08—Safety, indicating, or supervising devices
    • F02B77/082—Safety, indicating, or supervising devices relating to valves

Definitions

  • the present invention relates to an apparatus for checking the valve clearance of the inlet and exhaust valves of a piston engine.
  • valve clearances are checked manually with the aid of feeler gauges consisting of thin blades of metal of different thicknesses which, for clearance checking purposes, are inserted directly between, for example the base circle of the cam and the actuating face of a cup-tappet, or between other appropriate cooperating parts of the valve gear.
  • feeler gauges consisting of thin blades of metal of different thicknesses which, for clearance checking purposes, are inserted directly between, for example the base circle of the cam and the actuating face of a cup-tappet, or between other appropriate cooperating parts of the valve gear.
  • the actually existing valve clearance is then judged by the thickness or gauge of the respective feeler blade which can still, or no longer, be inserted freely in the existing gap.
  • the present invention has arisen from the consideration that the metallic noises which occur when the valves open and close--during valve-opening these noises being mainly caused by the final velocity of impact between the two corresponding elements of the valve gear which value depends on the value of existing valve clearance, while during valve-closing such noises are mainly generated by the final velocity of impact of the valve head relative to the associated valve seat--are time-staggered by a length of time which is directly associated with the size of valve clearance relative to the theoretical valve opening and closing times which are known from the crank-angle and cam-diagrams.
  • the present invention resides in that for the purposes of carrying out the checking operation the piston engine is extraneously driven, that at a predetermined point in the region of the valve gear at least one vibration-pick-up is applied to the surface of the piston engine to record solid-borne vibrations, the pick-up being connected to a processor unit and feeding into this unit signals which correspond to solid-borne vibrations occurring at its mounting site, that an angle-mark transmitter is provided on the crank assembly of the piston engine and is connected to the processor unit and in co-operation therewith issues reference signals corresponding to at least one defined angular position of the crank assembly, that the processor unit comprises a gate circuit which, triggered by the reference signals of the angle-mark transmitter, is open, at least within the time zone, known from the crank angle diagram, of one of the two end points of each valve movement, in respect of the received solid-borne vibration signals, and that the signals which pass through the gate circuit are applied to a limit-value-circuit associated with the processor unit which, by a comparison of levels with at least one trigger
  • the windows in the gate circuit may be set in such a manner that the points in time which are known from the crank-angle diagram or cam diagram, taking into account also the ideal valve clearance values, will be at the start of the open range because this brings all those noises which are generated at this point in time directly into the open range of the gate circuit so that a relatively high signal level can be registered.
  • the limit-value circuit comprises two trigger levels for each window of the gate circuit, the first trigger level being above the base level existing without valve noise and the second trigger level being above the maximum level originating from one single valve.
  • the second level check has a positive result this means that in the observed crank-angle range the noise occurs of not just one but of at least one further valve, which likewise indicates wrongly adjusted valve clearance. If all valve clearances in the whole engine were correctly adjusted therefore, the first level check would produce in all windows of the gate circuit a positive, and the second level check a negative result.
  • the limit-value-circuit is preceded by a signal rectifier and associated integrator which increases the intensity of the signal which is available for the level comparison and thereby improves accuracy.
  • FIG. 1 shows a schematic representation of an embodiment of apparatus according to this invention
  • FIG. 2 shows the piston stroke curve of one single cylinder of the engine shown in FIG. 1,
  • FIG. 3 shows the camlift curves associated with FIG. 2
  • FIG. 4 shows the solid-borne-vibration signals which occur
  • FIG. 5 shows the signals which control the gate circuit of the processor unit according to FIG. 1.
  • a four-cylinder internal combustion engine 1 represented in FIG. 1 is driven extraneously by a separate motor 2 with the aid of a coupled drive transmission shaft 3.
  • a vibration pick-up 5 to record solid-borne vibrations at the surface of the internal combustion engine 1, each pick-up being connected by a lead 6 to a processor unit which it feeds with signals corresponding to solid-borne vibration occurring at the place where it is fitted.
  • the illustrated positional sites of the vibration pick-ups 5 are freely variable to suit given conditions; also, in certain circumstances it is possible to work with just one, or else with more than two, vibration pick-ups.
  • an angle-mark transmitter 8 which is connected to the processor unit and in cooperation therewith delivers reference signals corresponding to at least one defined angular position of the crank assembly of the internal combustion engine.
  • the processor unit comprises a gate circuit 9 which, triggered by the reference signals of the angle-mark transmitter 8, is open to the solid-borne vibration signals arriving via leads 6 at least within the time-range, known from the crank-angle diagram of the internal combustion engine, of one of the two end points of each valve displacement.
  • the "open" regions of the gate circuit 9 which is triggered by the reference signals of the angle-mark transmitter 8 are adjustable by means of an adjusting unit 10 in respect of their relative position as well as with regard to their respective widths.
  • the signals of the vibration pick-ups 5 which pass through the gate circuit 9 are passed through a rectifier circuit 11 and an integrator 12 to a limit-value-circuit 13 which, by level comparison against two trigger levels provides a "good/bad" statement or readout in an associated indicator device 14.
  • the trigger levels in the limit-value circuit 13 are separately adjustable in respect of their level value for each window of gate circuit 9 by means of an adjusting unit 15.
  • FIG. 2 shows the piston stroke curve between two ignition, top dead centers 16--that is to say for one complete cycle of a four-stroke engine; between the two ignition top dead centers 16 the two bottom dead centers 17 and the change-over top dead center 18 are indicated.
  • the associated lift curves are shown of the valve-actuating cams, 19 being the lift curve associated with the exhaust valve and 20 the lift curve associated with the inlet valve.
  • the gate circuit 9 which is synchronized with the angle-mark transmitter 8, for example at signal repeat sequences corresponding to FIG. 5, the signals issued by the pick-ups 5 which arrive within the "open" time zone are fed into a rectifier circuit 11, whereafter the rectified signal amplitudes are accumulated in integrator 12 during the "open" period of the corresponding windows.
  • the summation signals which are maintained at the integrator 12 for a certain predeterminable length of time following the closing of the windows are then checked in the limit-value circuit 13 against two trigger levels, the lower of these trigger levels being arranged, for example, above the basic level which exists without any valve noise at all, and the upper trigger level being higher than the maximum level of noise caused by one single valve.
  • the limit-value circuit 13 therefore provides in this case two statements about exceeded level values which can be utilised in the indicator unit 14 to provide a "good/bad" read-out in respect of valve clearance.
  • the indicator unit 14 may also enable a general overall valuation to be obtained in respect of the valve gear due to the provision in said unit of memories for storing the informations obtained from the comparison of levels within the range of the individual windows which, for example after a run through several crank cycles enables mean values to be formed and so improves measuring accuracy.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
  • Indication Of The Valve Opening Or Closing Status (AREA)
US06/492,653 1982-05-12 1983-05-09 Apparatus for checking valve clearance of the inlet and exhaust of a piston engine Expired - Lifetime US4483185A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT1872/82 1982-05-12
AT0187282A AT397579B (de) 1982-05-12 1982-05-12 Einrichtung zur kontrolle des ventilspiels

Publications (1)

Publication Number Publication Date
US4483185A true US4483185A (en) 1984-11-20

Family

ID=3522834

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/492,653 Expired - Lifetime US4483185A (en) 1982-05-12 1983-05-09 Apparatus for checking valve clearance of the inlet and exhaust of a piston engine

Country Status (7)

Country Link
US (1) US4483185A (ko)
JP (1) JPS58213208A (ko)
AT (1) AT397579B (ko)
DE (1) DE3316588C2 (ko)
FR (1) FR2526865B1 (ko)
GB (1) GB2122350B (ko)
IT (1) IT1194233B (ko)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5515712A (en) * 1992-05-01 1996-05-14 Yunick; Henry Apparatus and method for testing combustion engines
US5531100A (en) * 1994-06-10 1996-07-02 Robert Bosch Gmbh Method of detecting a leaky exhaust valve
US5705742A (en) * 1995-12-01 1998-01-06 Trend Products, Inc. System and method for testing an engine
EP0916815A3 (en) * 1997-11-12 1999-08-11 Fuji Jukogyo Kabushiki Kaisha Apparatus and a method for detecting the valve timing of electromagnetic engine valves
US6205850B1 (en) * 1999-07-13 2001-03-27 Honda Of America Mfg., Inc. Method for setting tappet clearance
GB2355536A (en) * 1999-08-16 2001-04-25 Siemens Ag Method for determining valve clearance
US6471299B2 (en) 2001-02-15 2002-10-29 Caterpillar Inc Mooring device for maintaining a dump body in a raised position
US6481269B2 (en) * 1996-07-19 2002-11-19 Toyota Jidosha Kabushiki Kaisha Method of testing assembled internal combustion engine
US20030145813A1 (en) * 2001-11-23 2003-08-07 Georg Buhl Method and system for identifying valve clearances and position of valve opening cams
RU2484440C1 (ru) * 2011-12-12 2013-06-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Челябинская государственная агроинженерная академия" Способ диагностирования газораспределительного механизма двигателя внутреннего сгорания и устройство для его осуществления
RU2523595C1 (ru) * 2013-03-25 2014-07-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Челябинская государственная агроинженерная академия" Способ диагностирования газораспределительного механизма карбюраторного двигателя внутреннего сгорания и устройство для его осуществления
RU2550235C2 (ru) * 2013-07-09 2015-05-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Челябинская государственная агроинженерная академия" (ФГБОУ ВПО ЧГАА) Устройство для диагностирования газораспределительного механизма двигателя внутреннего сгорания
WO2015195036A1 (en) * 2014-06-17 2015-12-23 Scania Cv Ab Method and device for diagnose of valves of an internal combustion engine
US20160370255A1 (en) * 2015-06-16 2016-12-22 GM Global Technology Operations LLC System and method for detecting engine events with an acoustic sensor
US20160370254A1 (en) * 2015-06-22 2016-12-22 General Electric Company Cylinder head acceleration measurement for valve train diagnostics system and method
US10844786B2 (en) 2018-10-24 2020-11-24 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Method for the predictive maintenance of internal combustion engine components by means of a structure-borne sound sensor

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2146119B (en) * 1983-09-05 1987-07-01 Froude Consine Ltd Detection of fuel injection
FR2692984B1 (fr) * 1992-06-29 1996-12-13 Souriau Diagnostic Electron Sonde destinee au controle d'un moteur a combustion interne.
DE19529155B4 (de) * 1995-08-08 2007-05-24 Fev Motorentechnik Gmbh Verfahren zur Messung des Ventilspiels an einem durch einen elektromagnetischen Aktuator betätigten Gaswechselventil
DE19917772B4 (de) * 1999-04-20 2014-09-11 Caterpillar Energy Solutions Gmbh Ventilspielüberwachungseinrichtung
JP3966500B2 (ja) * 2002-01-29 2007-08-29 ダイハツ工業株式会社 異音による不良検査装置
FR2999229B1 (fr) * 2012-12-10 2014-11-28 Sncf Procede et dispositif de reglage d'une pluralite de jeux fonctionnels d'organes mecaniques d'un moteur thermique
JP7287327B2 (ja) * 2020-03-31 2023-06-06 いすゞ自動車株式会社 エンジンバルブクリアランス異常検出装置及びエンジンバルブクリアランス異常検出方法
US11268411B2 (en) 2020-06-05 2022-03-08 Caterpillar Inc. System and method for engine valve lash calibration
DE102021121478B4 (de) * 2021-08-18 2023-07-13 Rolls-Royce Solutions GmbH Verfahren zum Überwachen des Betriebs einer Brennkraftmaschine, Steuergerät, eingerichtet zur Durchführung eines solchen Verfahrens, und Brennkraftmaschine mit einem solchen Steuergerät

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4370884A (en) * 1979-12-19 1983-02-01 Hans List Operational testing device for inlet valves and outlet valves of reciprocating engines
US4389882A (en) * 1980-06-05 1983-06-28 Toyota Jidosha Kabushiki Kaisha Method and apparatus for determining an abnormality in a valve actuating system of an internal combustion engine

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB382292A (en) * 1931-06-22 1932-10-24 Rupert Evan Howard Carpenter Methods and apparatus for analysis and measurement of noise and other mechanical vibrations associated with running machinery
GB544249A (en) * 1939-06-01 1942-04-03 Sperry Gyroscope Co Inc Improvements in or relating to apparatus for detecting detonation in internal combustion engines
NL76862C (ko) * 1947-05-15 1954-08-16
GB1303101A (ko) * 1970-01-07 1973-01-17
US3777559A (en) * 1972-04-21 1973-12-11 Northrop Corp System for analyzing engine performance
CH641907A5 (en) * 1979-03-27 1984-03-15 Burckhardt Ag Maschf Device for monitoring the operational characteristic of the valves of a piston compressor
JPS5658605A (en) * 1979-10-19 1981-05-21 Hitachi Ltd Detecting method for abrasion of frictional substance
DE3004605A1 (de) * 1980-02-08 1981-08-13 Robert Bosch Gmbh, 7000 Stuttgart Verfahren zur messung des ventilspiels einer brennkraftmaschine
GB2089986A (en) * 1980-12-22 1982-06-30 Froude Eng Ltd Detecting fuel injector opening
GB2103366A (en) * 1981-06-27 1983-02-16 Lucas Ind Plc Test apparatus for ignition timing
JPS618251A (ja) * 1984-06-25 1986-01-14 Nachi Fujikoshi Corp 工具ホルダ

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4370884A (en) * 1979-12-19 1983-02-01 Hans List Operational testing device for inlet valves and outlet valves of reciprocating engines
US4389882A (en) * 1980-06-05 1983-06-28 Toyota Jidosha Kabushiki Kaisha Method and apparatus for determining an abnormality in a valve actuating system of an internal combustion engine

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5515712A (en) * 1992-05-01 1996-05-14 Yunick; Henry Apparatus and method for testing combustion engines
US5531100A (en) * 1994-06-10 1996-07-02 Robert Bosch Gmbh Method of detecting a leaky exhaust valve
US5705742A (en) * 1995-12-01 1998-01-06 Trend Products, Inc. System and method for testing an engine
US6481269B2 (en) * 1996-07-19 2002-11-19 Toyota Jidosha Kabushiki Kaisha Method of testing assembled internal combustion engine
US6711944B2 (en) 1996-07-19 2004-03-30 Toyota Jidosha Kabushiki Kaisha Method of testing assembled internal combustion engine
EP0916815A3 (en) * 1997-11-12 1999-08-11 Fuji Jukogyo Kabushiki Kaisha Apparatus and a method for detecting the valve timing of electromagnetic engine valves
US6205850B1 (en) * 1999-07-13 2001-03-27 Honda Of America Mfg., Inc. Method for setting tappet clearance
GB2355536A (en) * 1999-08-16 2001-04-25 Siemens Ag Method for determining valve clearance
GB2355536B (en) * 1999-08-16 2003-06-11 Siemens Ag Method for determining valve clearance
US6471299B2 (en) 2001-02-15 2002-10-29 Caterpillar Inc Mooring device for maintaining a dump body in a raised position
US20030145813A1 (en) * 2001-11-23 2003-08-07 Georg Buhl Method and system for identifying valve clearances and position of valve opening cams
US6789518B2 (en) * 2001-11-23 2004-09-14 Bayerische Motoren Werke Aktiengesellschaft Method and system for identifying valve clearances and position of valve opening cams
RU2484440C1 (ru) * 2011-12-12 2013-06-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Челябинская государственная агроинженерная академия" Способ диагностирования газораспределительного механизма двигателя внутреннего сгорания и устройство для его осуществления
RU2523595C1 (ru) * 2013-03-25 2014-07-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Челябинская государственная агроинженерная академия" Способ диагностирования газораспределительного механизма карбюраторного двигателя внутреннего сгорания и устройство для его осуществления
RU2550235C2 (ru) * 2013-07-09 2015-05-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Челябинская государственная агроинженерная академия" (ФГБОУ ВПО ЧГАА) Устройство для диагностирования газораспределительного механизма двигателя внутреннего сгорания
WO2015195036A1 (en) * 2014-06-17 2015-12-23 Scania Cv Ab Method and device for diagnose of valves of an internal combustion engine
US20160370255A1 (en) * 2015-06-16 2016-12-22 GM Global Technology Operations LLC System and method for detecting engine events with an acoustic sensor
US20160370254A1 (en) * 2015-06-22 2016-12-22 General Electric Company Cylinder head acceleration measurement for valve train diagnostics system and method
US9933334B2 (en) * 2015-06-22 2018-04-03 General Electric Company Cylinder head acceleration measurement for valve train diagnostics system and method
US10844786B2 (en) 2018-10-24 2020-11-24 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Method for the predictive maintenance of internal combustion engine components by means of a structure-borne sound sensor

Also Published As

Publication number Publication date
JPH0454161B2 (ko) 1992-08-28
IT8321052A0 (it) 1983-05-11
DE3316588C2 (de) 1984-06-20
IT8321052A1 (it) 1984-11-11
GB8313071D0 (en) 1983-06-15
GB2122350B (en) 1986-02-12
FR2526865B1 (fr) 1992-04-24
AT397579B (de) 1994-05-25
IT1194233B (it) 1988-09-14
GB2122350A (en) 1984-01-11
ATA187282A (de) 1993-09-15
FR2526865A1 (fr) 1983-11-18
DE3316588A1 (de) 1983-11-17
JPS58213208A (ja) 1983-12-12

Similar Documents

Publication Publication Date Title
US4483185A (en) Apparatus for checking valve clearance of the inlet and exhaust of a piston engine
US7089895B2 (en) Valve operation in an internal combustion engine
US20160370255A1 (en) System and method for detecting engine events with an acoustic sensor
US4483184A (en) Automatic diagnostic device for a four-stroke-internal combustion engine
US10844786B2 (en) Method for the predictive maintenance of internal combustion engine components by means of a structure-borne sound sensor
US7559230B2 (en) Method and device for analyzing the combustion noise in a cylinder of an internal combustion engine
EP1290420B1 (en) System and method for providing engine diagnostic and prognostic information
US5355713A (en) Cold engine testing
US20090182491A1 (en) Method and system for filtering a disturbed cylinder pressure signal from a cylinder in an internal combustion engine
JP3445783B2 (ja) 内燃機関のシリンダ内の圧力を表す関連変数を決定する方法
Liu et al. Detection of engine valve faults by vibration signals measured on the cylinder head
JPS62261024A (ja) 振動解析装置
EP2339151B1 (en) Method for controlling the movement of a component that moves towards a position defined by a limit stop in an internal combustion engine
GB2413850A (en) Monitoring valve events in an internal combustion engine using a vibration sensor
US6910369B2 (en) Apparatus for detecting compression top dead center of an engine
Pischinger et al. A new measuring method for the direct determination of Diesel engine combustion noise
US4453402A (en) Method and apparatus for determining the position of a piston in the cylinder of a reciprocating engine
JPH04250330A (ja) エンジンの動弁系統部品の摩耗試験装置
SU1302163A1 (ru) Способ диагностировани механизма газораспределени двигател внутреннего сгорани
JPH0237535B2 (ko)
US20020020211A1 (en) Method for testing a completely or partially assembled combustion engine
CN114555928B (zh) 操作内燃机的方法和操作火花点火式内燃机的方法
CN114544186B (zh) 一种发动机失火诊断方法及车辆
Moshrefi et al. Gasoline engine piston pin tick noise
Lus Tuning method for high-speed marine Diesel engine MB820 type

Legal Events

Date Code Title Description
AS Assignment

Owner name: A V L GESELLSCHAFT FUR VERBRENNUNGSKRAFTMASCHINEN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:KUNZFELD, WILHELM;REEL/FRAME:004130/0767

Effective date: 19830429

Owner name: A V L GESELLSCHAFT FUR VERBRENNUNGSKRAFTMASCHINEN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KUNZFELD, WILHELM;REEL/FRAME:004130/0767

Effective date: 19830429

CC Certificate of correction
STCF Information on status: patent grant

Free format text: PATENTED CASE

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

CC Certificate of correction
FPAY Fee payment

Year of fee payment: 4

FPAY Fee payment

Year of fee payment: 8

REMI Maintenance fee reminder mailed
FPAY Fee payment

Year of fee payment: 12

SULP Surcharge for late payment